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PCM(roll-coating) |
spray-coating |
Factors of Color differece |
1、Oven height under 30cm,less difference in temperature between top and bottom |
2、Panel paralled in a fixed temperature spot of the oven |
3、Coating in flat |
Non-difference in color |
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1、Oven height over 150cm,higher difference in temperature. |
2、Vertical panel in different temperature spot of the oven |
3、A polyhedral panel after shaped , manual re-spraying of its side is
necessary |
Color difference |
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factors of flatness |
Baking under high temperature, panel deformation can be flatted by machine after its internal stress released. Flat panel then is shaped afterwards. |
Super flat |
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Shaped panel in oven with high temperature, deformed by internal stress releasing both from panel itself and its shaping
Shaped panel deformed can not be flatted or shaped again, |
Deformed and flatless |
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Factors of smooth surface |
PCM form a coat under printing pressure,there is no particle on surface and non-porous |
Smooth surface |
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Spray-coating is a way of electrostatic adherence, there are particles and porous on the coat and surface of the panel |
Smoothless Surface |
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Factors of contaminantion |
Contaminant cannot infiltrate into or be absorbed on the coat which is non-porous and without particle |
Without contamination |
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Contaminant can infiltrate the coat into the panel surface since the coat with particles and porousness |
Contaminating easily |
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Cleaning |
Dust on surface can be cleaned by rain. |
Easily to clean |
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With a smoothless and contaminated surface, I t is hardly to be cleaned after several years penetration |
Hardly to clean |
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Factors of density and wear-resistance |
PCM for 3 coat-3 bake, printing with high pressure, paint is compact on the surface of panel, which have the property of wear-resistance. |
Higher paint density for better property of wear-resistance |
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Spray-coating is 3 coat-1 bake,coated by electrostatic adherence, paint particle piled up on the surface, on which it have poor property of wear-resistance. |
Lower paint desity with poorer property of wear-resistance than PCM |
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Factors of coat thickness |
Under press coating, flat panel is stressed evenly,its coat thickness torlerance less than 0.5u. |
Even coat thickness |
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Under electrostatic adherence coating, coat thickness between center and four side are uneven, their tolerance over 7u. “L” shape panel has been to be re-painted again by hand.This is the one of main reason of color difference. |
Uneven coat thickness |
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Anti-stretch force |
After high temperature baked, panel is cooled by special way. |
Maintain anti-stretch force of aluminum substrate |
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By natural cooling way after high temperature baked |
Anti-stretch force of Aluminum decreased |
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